Hi, when i mesure with dims, the tube is 2744.3 millimeters, same in the detail window. when i clic on the style name, it is 3018.704 millimeters ???
Where are these 274.404 millimeters? Any ideas ?
Paquicinno

Hi Paquicinno.
This is what this model looks like if you apply the "Separate" command to it and apply the "Show pts" command to the outer surface.
This is fixed as follows: apply the commands "Separate" and "Boolean/Union" to the model.

https://disk.yandex.ru/d/sxXhqWmT6qid5Q

Hi WN, i get it. That solve the dimensioning issue. But when i separate again and show point, there is still that ghost part. I join the entire part for better understanding.
Paquicinno

Hi Paquicinno, that's a bug in the size calculation where it's accidentally using some areas of the larger "underlying surface" that has been trimmed away.

In this case if you select the object and then type Tab and then type ShrinkTrimmedSrf and push Enter, it should get rid of the extra reported size.

re:
> But when i separate again and show point, there is still that ghost part.

When you cut an object with a boolean operation, the original full size surface is still present, it just has new trim curves on it that mark which areas have been cut away. You will see the full underlying surface with show points like this, and also if you select all edges and hit Delete it will erase the trim boundaries and recover the full underlying surface.

The ShrinkTrimmedSrf command will shrink down extra area of the underlying surface that is outside of the current trim boundaries.

So anyway having this "ghost part" is just a normal part of how booleans and trimming surfaces work. But there is a bug with the tight bounding size calculation for this particular object.

- Michael

OK thank you, that make sens
Have a good day
Paquicinno